Reference Summary: Carl Sagan explains how Eratosthenes calculated circumference of the Earth Video clips from: NASA "The Planets", BBC "Cosmic Voyage", IMAX Audio: "Pale Blue Dot" -
Carl Sagan Astronomer Of The People -
Carl Sagan explains how Eratosthenes calculated circumference of the Earth Video clips from: NASA "The Planets", BBC "Cosmic Voyage", IMAX Audio: "Pale Blue Dot" -
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- Carl Sagan explains how Eratosthenes calculated circumference of the Earth
- Video clips from: NASA "The Planets", BBC "Cosmic Voyage", IMAX Audio: "Pale Blue Dot" -
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